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22 ANALYTICAL AND LABORATORY EQUIPMENT


LAB REACTORS for COSMETIC INDUSTRY


Kai-Oliver Linde details the technical solution to better cosmetic products I


n the process of developing cosmetic products at laboratory scale, it is very common for many laboratories to perform the majority of production steps separately and manually. But it is much more convenient and easier to produce cosmetics or reproduce cosmetic production processes on a smaller scale. Working with a complete reactor-system, which allows controlling of all necessary processes taking place, while developing new products or finding solutions to problems in the production area, is a far more efficient approach. IKA offers a complete solution to the cosmetic industry, from small-scale 500mL to 4,000L reactor systems. With its lab reactor systems such as the LR.2-ST and the LR 1000, the company


combines the most important processes needed in the production of cosmetics in one device. Te reactor is designed for products such as lipstick, lotions, shampoos, ointments, creams of all sorts, colloids (gels), eyeliner, mascara, etc. A number of processes


are of interest during the development of a cosmetic product. Tis includes, amongst others, mainly the stirring, homogenization, heating and cooling (temperature measurement and control), pH measurement, vacuum, torque-measurement (viscosity) and data collection through software.


Homogenization In many applications for cosmetic products the first step is to bring an oil- and water-


phase (o/w; w/o) together and homogenize it to a degree that a stable emulsion is created, supported by a proper chosen emulsifying agent. Typically, homogenizers such as the Ultra Turrax T 25 digital are used for such challenges. By choosing the right rotor stator geometry of a dispersing tool, different degrees of fineness can be obtained, down to 1µm . Te fast-turning rotor of a dispersing tool creates a suction effect and forces the oil through the teeth of the stator. In the gap between the rotor and stator the actual homogenization process takes place. Te shear-rate depends on the circumferential speed and the size of the gap. Te higher the shear rate, the higher the energy introduced into the emulsion.


The LR 1000 combines the most important processes for cosmetics production in one device


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